Compare Calendar APIs
Deep dive into the technical specifications of 16 Calendar APIs. Use this side-by-side comparison to evaluate which service best fits your architectural requirements.
| API Identity | Score | Authentication | HTTPS | CORS | Speed | Difficulty | Brief |
|---|---|---|---|---|---|---|---|
| Calendarific | 72 B Est. | API Key | ? | - | Intermediate | Calendarific is a REST API that returns public holidays for over 230 countries and territories, supp... | |
| Checkiday - National Holiday API | 77 B Est. | API Key | ? | - | Intermediate | Checkiday is a holiday data API covering more than 5,000 national days and observances in the United... | |
| Church Calendar | 37 F Est. | No Auth | ? | 291ms | Beginner | Church Calendar (calapi.inadiutorium.cz) is a free, no-auth REST API that returns the Roman Catholic... | |
| Czech Namedays Calendar | 55 D Est. | No Auth | ? | 43ms | Beginner | The Czech Namedays Calendar API lets you look up the Czech or Slovak nameday (svátek) associated wit... | |
| Festivo Public Holidays | 82 A Est. | API Key | Yes | - | Intermediate | Festivo is a public holidays API covering more than 60 countries with regional subdivision support, ... | |
| Google Calendar | 68 C Est. | OAuth | ? | - | Advanced | The Google Calendar API allows you to programmatically read, create, update, and delete events on an... | |
| Hebrew Calendar | 80 A Measured | No Auth | ? | 670ms | Beginner | The Hebcal API provides free Jewish calendar data including Hebrew date conversions, Shabbat candle-... | |
| Holidays | 82 A Est. | API Key | ? | - | Intermediate | Holiday API (holidayapi.com) provides historical and current public holiday data for over 100 countr... | |
| LectServe | 77 B Est. | No Auth | ? | 245ms | Beginner | LectServe is a free REST API that returns Revised Common Lectionary readings — Scripture passages as... | |
| Nager.Date | 84 A Est. | No Auth | No | 42ms | Beginner | Nager.Date is a completely free, open-source REST API providing public holidays for over 90 countrie... | |
| Namedays Calendar | 77 B Est. | No Auth | Yes | 1089ms | Beginner | Namedays Calendar provides name day traditions for dozens of countries, letting you look up which na... | |
| Non-Working Days | 87 A Est. | No Auth | ? | 72ms | Beginner | Non-Working Days provides ICS calendar files for public holidays and non-working days across many co... | |
| Non-Working Days | 87 A Est. | No Auth | Yes | 308ms | Beginner | IsDayOff.ru is a minimalist REST API that returns whether a given date is a working day, non-working... | |
| Public Holidays | 92 A+ Est. | API Key | Yes | - | Intermediate | Abstract's Public Holidays API delivers structured data about national, regional, and religious holi... | |
| Russian Calendar | 84 A Est. | No Auth | No | 71ms | Beginner | Russian Calendar API checks whether a specific date is a holiday, working day, or short day in Russi... | |
| UK Bank Holidays | 87 A Est. | No Auth | ? | 58ms | Beginner | The UK Bank Holidays API is an official UK government endpoint that returns all bank holidays for En... |